DL 9975 then B6 993 at Boston
Miami (MIA) → Boston → Denver
Timetable, Boston time
02:50DL 9975 from Miami (MIA) at the gate
10:22B6 993 to Denver leaves the gate
7 h 32 apart on the timetable
The last days
DL 9975 and B6 993 weren’t both flown 15 min to 12 h apart in the last 21 days.
Statistics from past flights, not live flight information. Always check times and your connection with your airline, and don’t base travel or booking decisions on these numbers.